390842819 has 2 divisors, whose sum is σ = 390842820. Its totient is φ = 390842818.

The previous prime is 390842747. The next prime is 390842849. The reversal of 390842819 is 918248093.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 390842819 - 2²⁰ = 389794243 is a prime.

It is a super-2 number, since 2×390842819² = 305516218327733522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 390842819.

It is not a weakly prime, because it can be changed into another prime (390842849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195421409 + 195421410.

It is an arithmetic number, because the mean of its divisors is an integer number (195421410).

Almost surely, 2^390842819 is an apocalyptic number.

390842819 is a deficient number, since it is larger than the sum of its proper divisors (1).

390842819 is an equidigital number, since it uses as much as digits as its factorization.

390842819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 390842819 is about 19769.7450413504. The cubic root of 390842819 is about 731.1402827182.

The spelling of 390842819 in words is "three hundred ninety million, eight hundred forty-two thousand, eight hundred nineteen".